Walls and Ceilings - Plaster over paint???

I'm currently fitting a new kitchen, I'm now at the stage of making good the walls, having removed the disgusting vinyl tile-effect wallpaper. Underneath, the walls have been painted in a waterproof gloss or eggshell, which is firmly attached and would be a pain to remove. I've put new electrics in around the room (there was one single socket in the whole room before!) and patched up, so there are channels of fresh plaster running up each wall. I plan to eventually paint the walls rather than wallpaper so I need a nice smooth finish, and I don't fancy painting the walls in their current state, I'm positive the plastered channels would stick out like a sore thumb. Can I skim plaster the whole wall, straight over the paint??? I'm presuming I'd need to key the walls, maybe give it a good thrashing with a brick hammer? Would just sugar soaping and maybe a coating of PVA solution be enough? This is my second project in my gorgeous new house (fitted central heating already), and I plan to stay here for a loooong time, so I don't want the plaster to start falling off in a few years!! All help and advice greatly appreciated

Thx

Lon

You will definitely have to scatch the surface of that glossy paint. Maybe with some gritty sand paper. After that you should be able to skim over everything. First coat won't want to stick too well but all other coats will be fine.

I have a friend who has a plaster business. I know all he does is apply muratic acid over the paint. I suppose this crackles the paint and gives him his bond. I do not know the strength he uses, although I do know 1:5 acid/water is a fairly strong mixture. I would think gloves and a spong(smooth wall) or misting bottle (rough wall) would suffice.

Add the acid to the water not the water to the acid.